Live coal spreader for underfeed type of stoker furnaces



July 24, 1951 T. w. FAULL LIVE COAL SPREADER FOR UNDERFEED TYPE OF'STOKER FURNACES Filed Dec. 31, 194s 'INVENTQR THOMAS W FAULL @xL-ATTORNEY Patented July' 24, V1951 '2,561,918 OFFICE LIVE COAL SPREADERFOR NDERFEED TYPE OF STOKER FURNACESl Thomas W. Faull, Dunkirk, Ind. yApplication December 51, i948, serial No, 68,459

This inventionrelates to improvements in stoker fed furnaces.

Whereas in -the operation of a furnace of -l above description whereinthe fuel is fed upwardly, as by a conventional automatic underfeedstoker, advantages have been accomplished by controlling the delivery ofcoal to the retort,

mitted into the combustion chamber of the furnace, there is still to becontended with the -problem of how best to keep the fire clean. That tosay, how best to minimize lthe obstructive and by regulating of the airdraft that is adeffects which are incident to the formation of clinkers.f

'v A cause of uneven distribution of fuel, and of clinkering which haspresented a most diflicult problem, is that wherein a fusing takes placein the median portion of the fuel retort-'and burner thereby. resultingin a cone or coke tree which rises to a relatively high plane above thefire bed whence it topples. The tumbled down mass so imposed upon thevfire bed forms a clinker deposit which not only obstructs combustion,but interferes with Stoker control. Said deposit also involvesconsiderable inconvenience and the expenditure of special labor in there. moval of same..

It is with the above .phase of clinkering that my invention isconcerned, and the object, broadly stated. is to provide an applianceadapted to be positioned within the confines of the come bustion chamberof the furnace, and to. so function in combination with and in relationto the Stokenthat the cokecone in its rise, is stopped vbefore it willbecome enlarged and fused, and whereby the mass so stopped, will bedisintegrated and the fragmentary portions thereof caused to subsideandto be dispersed in the re bed. t

The said object, together .with certain specific aims as will -presentlyappear, are accomplished by, and my invention is embodied inthe newconstruction, combination and arrangement of .parts illustrated in theaccompanying drawings and described in the following specification.

The several parts of the invention, as they appear in the differentviews in the drawings are identified by suitable characters of referenceapplied to them.

Figure 5 is a top plan view, taken on the section line vandvin thedirection of arrows 5-5 in Figurefi. f i f In a furnace of the typicalform and structure indicated 'in the drawing, the upper portion II ofthecylindrical body of the furnace forms a combustion chamber, and thelower portion I4 of said-body forms the fire pot. yConduit I5,rectangularin cross section extends from-said combustionchamber andthrough the casing I6 of the furnace body, and is closed by aconventional inspection door I8.

The fuel, as semi-pulverized coal, is fed by y means of a Stoker whichincludes coal tube I9,

Worm 20, upwardly directed retort 2l, and an-` nularburner 2,2, throughwhich said burner, air" for supporting combustion is admitted throughair duct 23. In the space 24 within the connes of the casing I6, iscirculation of heat conveying air. The coal propelled by the worm movesup.- Wardly into the retort and the burnerwhence it reaches the hot cokeor live flre bed 26. To maintain proper ydepth and condition of the firebed, the power transmissiondevice (not shown) which actuates the worm;and the blower mechanisms (not shown) which provides air flow throughduct23, .are capable of being controlled and regulated according to theheating requirements, it being essential that a constant draft over thefire be had. n

As a consequence of any failure of supervisory control and Vadjustmentofthe stoker coal feed and the stoker air flow to meet changingconditions which are incident to varying heating requirements and tovarying qualities and consistencies of the `fuel used, there occurs apassing of air currents up alongside the cylindrical central zone .ofthe fuel mass. Resultant from the action of said currents is the fusionof the median or central portion of the fuel into a mass which rises ina cohesive cone or tree-like formation called a coke tree. It graduallyrises high in the combustion chamber, becomes clinkered in consistencyand finally topples, thus becoming imposed on the fire bed and causingsuch obstruction to combustion that the iire bed is renderedinei-Iicient and subject to be restored tonormal condition.

In .the drawings:

. Figure 1 is a top plan view of my new. appliance. Figure 2 is a sideview of the device the base portion thereof being shown in cross sectionon section line and` in the direction of arrows 2-2 n of the manualbreaking up vand removing the in Figure 1.

Figure 3 is a top plan view. taken on the section lineand in thedirection of arrows 3'v3 in Figure 2.

Figure 4 is a side view of a furnace and underfeedstoker connections,portions of the furnace casing being broken away, and a portion of thefurnace structure proper being shownV incross section, and my newappliance being shown as it aPpsars1noperative position. i

adjustment of coal feed and oflair flow.

The rendition of the fire bed into the above named ineicient condition,amount of care already existent and necessary in the breaking `up anddistributing of usual clinkers, and it brings on the additionalnecessity clinkered mass which will have formed as aforesaid. Saidcondition is accompanied of course by interruption of the heatingservice, and in many instances is accompanied by such an abnormalcondition in the re bed, that in order to get said fire bed restored tonormal and proper burning conditions, a complete removal of ashes andclinkers is necessitated, as is also required new augments l the 3 Mynew'appuanee gm; mini" ,ing-nie adverse effects which' are'incident tocok tree formations, in the typical representation here presented, is

dential heating. A base member consists of a nat forms a head piece 32.Y 33 integrated with said base member projects up;

Wardly beyond the plane of the top of saidheadf .z-

piece 32 and it is provided with a transverse hole 34.` At,allocation,spaced-*from saidfpivot pin is aA concentric 'apertura-35oflength indicated .in

Figure 3. Hole 36 in said base member ,will pres,-

,ently,be-referredto.l v

A reach arm 37 arched information, made` of ,resilient steelbarmetal`has its-one end por-tion secured as byabolt 38 and nut 39 to the topside of ametal disk lli). Theother andjdownwardly directed part ofvsaidbar is turned at a` right the pivot pin 33 is received. Integrated with-andextending downwardly. from rthe end portion of said'foot pieceisa;stud;43. p

angler tofornra foot piece l-l. Provided inA said 55 ,foot lpiece is averticalbore d2 through which A disk l5 made of ref-ractoryiimaterial,as iire clay,y is of, diameterl approximatelygone third oi the diameterof the combustion chamber oi the furnace, and-.ispof substantialthickness.. 'it is secured, as: by imbedded bolts d@ (one. only ofWhichtsaidrbolts #Sis shown) to, said metal disk 40. The said basemember iscombined with the v:foot pieceI l of the said reach arm 3.1 -byplacing said reach arm ywith its foot-piece in en.- gagement with thetopl surface of the ,head piece 32 of the said basernember, the. pivotpinf 33 being received in bore 42, and the stud i3 being received-inthearcuate aperture 35.v` Upon `placing a washer-41 on the 'pivot pin, andthen disposing arcotter pin-48 through thel hole all, the

device is complete.

Installing vthe devicefin readiness for use -rconsistsin-'providing'ftwofthreaded'holes in al side of the floor portion I'lfofthev conduit l5 of the furnace ;then inserting v thedeviceI through saidconduit and disposingit'inuprightlposition and stud 43 coming toengagement with a-'nV end of the arcuatel aperture 35 The Stoker havingbeenv started andthe re bed having been established; the user now withthe poker (not shown), a usual accessoryior Stoker fed furnaces,`inserted through the conduit l5 and disposed against a side of thereach if* arm 37, swings said arm to position wherein the refractoryplate or disk 45 is at central position above the nre bed, as indicatedin Figure 5.

Whereas the refractory disk l54 so poised does not hinder combustion, itfunctions as a deflector the said mass, in its rise (as indicated by thebroken lines in Figure 4), becomes impinged against the bottom of saidrefractory disk and is thereby arrested.

l'ertecl againsttsaid diski'is y A, "silient reach arm. By this arrestor stopping of of size, general proportions and detail suitable-f for aconventional furnaceisintended forresi-VH turnen andliwbichi sai fflira: reactron by the re- -t-he rise of said mass, and by the reaction ofsaid reach armytheqsaid mass is caused to be disin- -,,-,tegratedsVIn'the disintegrating so caused, the bar 3 i having an upward bend andthence a parallelbendwhich f -I Anupright .pivot pin .I

disjoined chunk like portions are caused to be dispersed in broken andseparated manner upon the fire` bed, Thus tendency to clinkering isminimiied wand impairment of combustion is avoid'e'diA The saidrefractory disk also functions to arrest the ascent ofi fly ash and todisperse ySame sin: .t-hecentrali` zoneabovegthe; nre bedr The saidreach arm, capableepitV iseofi'being the usualt usefof the pokerin` thetransaction-of removing clinkers'fromtheffirebed and fuel mass andfor-workingaround-the outer portion of the or-king is a vusual procedureinthe-:conditioning;of lthefur-nace.` A

l'Ihereach arm extendingupwardly, as it. does, andbeingarchedas shown,besides havingrthe inherent and" :desired `characterist ici of strengthandresilienc-y, ,isf ofi. form; and' position: to so with,- stand thecombustion chamber temperature, as to be durable anddependable-under.alLconditions offiringg. f f f l Thefrapplianceis-fec,o 1f1or.rli,cal.;y Gf .manufactune dependable, f and easys lto;yhandle andto install. Its yuse is readily understoodrand; practiced.,k'Whereas It have shown myFi-nvent-ion-inwhat I consideri itspreferredform-czand-structurei in detai1t,will,be understood ythat minorchanges kand modifications maya be ,made-without departing from thespirit: yandl principle'vof my invention vor sacriiicinganyo'iitsadvantages. j

What :Lclaimas myiinventionjiszfi l i An attachment adaptable for use;ingconnect-ion with the? combustion chanrberstructuiie of aniunderfedfurnace, consisting f'off fa flatfbarihavingfan upward 'and-thence:parallel bend, which 'said bend forms ahead pie'ce,=rtherebeing-vaf-vertical hole throughl saidheadE piece andeant arcuate'slotconcentric tonth'e: said' hole, andt-helbase portion of said baru beingadaptedfto'beesecured -to an inner portion'of said: chamber structureandsnear the inspection conduit. thereof;an upright4 pivot pint securedto: said'l bar 'and having; its upper end projectingy through the iholeof-'and beyond the plane.,i of the; top-foi. saidhead` piece; andprovided with a diametric .holel extending therethrough; an uprightresilient reach arm' arched'at its-upper portion', said arm at itsflowerportion having-a right angle bendftoiforfm a foot' piece-there being avertical holerin saidfootpie andtin 'which said hole the aforesadipvo'tpinis1 received-,saidfoot piece: having;l a downwardly. directed? stud;which is receivedlin fthe: aforesaiidz arcuate slot; i aa Cotter pininstalled in the hole of saidipivo't pin-,anda disk like plate ofrefractory materiali secured", to

the-.dovsmWardlyir-directedfree..,end ofi thesaid v REFERENCES CITD iThe vfollowing*references are" ofre'cord' in' the Number s

